PHP - read file list from Directory [Directory 내 파일 목록 읽기]

$path = 'ftp://admin:herald@herald.ipdisk.co.kr/HDD2/photo/Best/';
$thumbpath = $path . 'thumb/';

$thumb_size = 200;

if (!file_exists($thumbpath)) {
    mkdir($thumbpath, 0777, true);
}

$files = array();
$handle = @opendir($path) or die("Unable to open $path");
//  $handle = @opendir($path) or die("Unable to open $path");
while ($file = @readdir($handle))
("." !== $file && ".." !== $file) && array_push($files, $file);
@closedir($handle);
sort($files); //uksort($files, "strnatcasecmp");

foreach ($files as $filename){
    //echo $filename + "\n";
    $src = $path . $filename;
    $dest = $thumbpath . $filename;
    //echo 'source file : ' . $src . ' === ' . 'destination file : ' . $dest . "\n";
    //if (!file_exists($dest) && !is_dir($filename))
    //    echo $dest . ' file not exist';//make_thumb($src, $dest, $thumb_size);
    if(!is_dir($src) && !file_exists($dest))
        make_thumb($src, $dest, $thumb_size);
        //echo $src . ' is directory';
}

$files = json_encode($files);
$path = json_encode($path);
$thumbpath = json_encode($thumbpath);
unset($handle,$ext,$file);